"I'm a highschooler in physics, and none of you could answer this... wow. its a matter of torque. the diameter of the rotor provides more neutons of torque than a smaller rotor. the formula is t=Rf
t=torque,R=radius,f=force applied. then you can get more complicated with all the angle of atack and lever arm crap, but screw that. lets say your *snicker* bb7's apply aprox 150 neutons of force. torque for a 160mm rotor would = 12,000 neutons. 185mm rotor = 13875 neutons, and a 203mm rotor = 15,225.
whatd u guys fail physics? jeez... "
Ingen aning..